"Angle" Preliminary PPT courseware for graphic understanding

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"Angle" Preliminary PPT courseware for graphic understanding

Think about it:

(1) Can you point out the sides and vertices of the angle you drew?

(2) What figures learned previously are on both sides of the angle, and what is their positional relationship?

(3) Can you describe what kind of geometric figure is called an angle?

Definition of angle:

An angle can be thought of as a ray rotating around its endpoint.

Definition of straight angle and circumferential angle:

A ray rotates around its endpoint. When the terminal side and the initial side are in a straight line, the angle formed is called a straight angle. When the terminal side continues to rotate, and when it coincides with the initial side again, the angle formed is called a circumferential angle.

True or False:

(1) The figure formed by two rays is called an angle.

(2) The size of the angle has nothing to do with the length of the side.

(3) There are two rays on both sides of the angle.

How to express angle

Angle is represented by "∠" and pronounced as "angle". There are four ways to represent angles:

(1) An angle can be represented by three capital letters, but the letter representing the vertex must be written in the middle.

(2) Use a letter to represent an angle, but there must be only one angle with this letter as the vertex.

(3) Use a number to represent the angle, draw an arc near the vertex, and write the number

(4) can also be represented by a Greek letter, draw an arc near the vertex, and write the Greek letter

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Update Time: 2024-07-04

This template belongs to Mathematics courseware People's Education Press Seventh Grade Mathematics Volume 1 industry PPT template

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